8342295: compiler/jvmci/TestJVMCISavedProperties.java fails due to garbage in output

[tzezula]

The compiler/jvmci/TestJVMCISavedProperties test fails due to overlapping output from the saved system properties. The initialization of savedProperties in jdk.vm.ci.services.Services is correctly synchronized, the issue suggests that two separate libjvmci compiler isolates are each printing their own set of saved properties.

In a successful test run, the CompileBroker thread aborts the VM before it completes initialization, displaying the error message Cannot use JVMCI compiler: Value of jvmci.Compiler is “null” (due to the -Djvmci.Compiler=null setting), and the message DONE IN MAIN is never printed. However, in the failed test output, the DONE IN MAIN message appears, indicating that the VM initialization completed and created the JVMCIRuntime instance. The CompileBroker thread might have concurrently initialized JVMCIRuntime in another isolate. Since each JVMCIRuntime initialization outputs system properties, this is likely the cause of the overlapping output.

The proposed solution is to use the -XX:+EnableJVMCI flag instead of -XX:+UseJVMCICompiler, to avoid this issue.

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Issue

• JDK-8342295: compiler/jvmci/TestJVMCISavedProperties.java fails due to garbage in output (Bug - P4)

Reviewers

• Doug Simon (@dougxc - Reviewer)

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[openjdk]

@tzezula This change now passes all automated pre-integration checks.

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After integration, the commit message for the final commit will be:

8342295: compiler/jvmci/TestJVMCISavedProperties.java fails due to garbage in output

Reviewed-by: dnsimon

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At the time when this comment was updated there had been 5 new commits pushed to the master branch:

• 309b929: 8336401: Remove the option onjcmd from the jdwp agent
• 401d0d6: 8335662: [AArch64] C1: guarantee(val < (1ULL << nbits)) failed: Field too big for insn
• 8591109: 8340698: JVMTI FRAME_POP event is sometimes missed if NotifyFramePop is called as a method is returning
• 0784011: 8340488: Clarify LocaleServiceProvider deployment on application module path
• 4dcc7f3: 8337536: AArch64: Enable BTI branch protection for runtime part

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[mlbridge]

Webrevs

• 01: Full - Incremental (7849ba67)
• 00: Full (306efecb)

[dougxc]

Looks good to me - thanks for fixing it.

[openjdk]

@tzezula Please do not rebase or force-push to an active PR as it invalidates existing review comments. Note for future reference, the bots always squash all changes into a single commit automatically as part of the integration. See OpenJDK Developers’ Guide for more information.

[dougxc]

Still looks fine.

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[tzezula]

/integrate

[openjdk]

@tzezula
Your change (at version 7849ba6) is now ready to be sponsored by a Committer.